GameStop Corp (NYSE:GME) shares are trading slightly higher after-hours Monday after the class-action lawsuit against Keith Gill, also known as Roaring Kitty, was voluntarily dismissed by the plaintiff. The Details: According to a court filing, the plaintiff, Martin Radev, filed to voluntarily dismiss the case alleging Gill manipulated GameStop’s stock price without prejudice to the defendant. GameStop shares ended Monday’ssession down by more than 5% after Gill disclosed a 6.6% passive stake in Chewy, Inc. (NYSE:CHWY) through a 13G filing. Gill owns 9,001,000 Chewy shares worth roughly $300 m…